MISC

2010年6月

COMPARATIVE STUDY ON THE PHOTOSYNTHETIC PROPERTIES OF PRASIOLA (CHLOROPHYCEAE) AND NOSTOC (CYANOPHYCEAE) FROM ANTARCTIC AND NON-ANTARCTIC SITES

JOURNAL OF PHYCOLOGY
  • Makiko Kosugi
  • ,
  • Yuya Katashima
  • ,
  • Shimpei Aikawa
  • ,
  • Yukiko Tanabe
  • ,
  • Sakae Kudoh
  • ,
  • Yasuhiro Kashino
  • ,
  • Hiroyuki Koike
  • ,
  • Kazuhiko Satoh

46
3
開始ページ
466
終了ページ
476
記述言語
英語
掲載種別
DOI
10.1111/j.1529-8817.2010.00831.x
出版者・発行元
WILEY-BLACKWELL PUBLISHING, INC

The terrestrial cyanobacterium Nostoc commune Vaucher ex Bornet et Flahault occurs worldwide, including in Japan and on the Antarctic continent. The terrestrial green alga Prasiola crispa (Lightf.) Kutz. is also distributed in Antarctica. These two species need to acclimate to the severe Antarctic climate including low ambient temperature and desiccation under strong light conditions. To clarify this acclimation process, the physiological characteristics of the photosynthetic systems of these two Antarctic terrestrial organisms were assessed. The relative rate of photosynthetic electron flow in N. commune collected in Japan and in Antarctica reached maxima at 900 and 1,100 mu mol photons . m(-2) . s(-1), respectively. The difference seemed to reflect the presence of high amounts of UV-absorbing substances within the Antarctic cyanobacterium. On the other hand, the optimal temperatures for photosynthesis at the two locations were 30 degrees C-35 degrees C and 20 degrees C-25 degrees C, respectively. This finding suggested a decreased photosynthetic thermotolerance in the Antarctic strain. P. crispa exhibited desiccation tolerance and dehydration-induced quenching of PSII fluorescence. Re-reduction of the photooxidized PSI reaction center, P700, was also inhibited at fully dry states. Photosynthetic electron flow in P. crispa reached a maximum at 20 degrees C-25 degrees C and at a light intensity of 700 mu mol photons . m(-2) s(-1). Interestingly, the osmolarity of P. crispa cells suggested that photosynthesis is performed using water absorbed in a liquid form rather than water absorbed from the air. Overall, these data suggest that these two species have acclimated to optimally photosynthesize under conditions of the highest light intensity and the highest temperature for their habitat in Antarctica.

Web of Science ® 被引用回数 : 15

リンク情報
DOI
https://doi.org/10.1111/j.1529-8817.2010.00831.x
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000278820000006&DestApp=WOS_CPL

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